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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26a7071374da7d28894d81a06d5fb2383ba05acb741dee97724272c3bf4bec34' 
  AND token = '12Sz0SdybI/OP5bwOOSSUaLq7Fzv97m4FPuVUx8eSGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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