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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98e6653a9a4f5f16ef35cf149c26b76b3b8a49a614def48b98a9d4b24a5cfed4' 
  AND token = 'zUPoeN7Ree/N0mk+ObJXAAziqHsxkO5XwzkdBS5na6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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