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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f9a4b2233e684f591452238403cc1ecd94b8c8011dd3e1e1c39a64f054d285e' 
  AND token = 'xm/sKaS6bpqAW/tcvGXA3Xjjv8oUA4R0wNWBTHaAOvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}