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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b263d21e9f71d67792920da0d1842128f7099bbca37d19ad304d03a245a52c5' 
  AND token = 'oUjLUEyHu/skiCAs9IATeRz0gN8LbOUHGrJxoH/zWbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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