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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0c7a97fd57ac57441c9c0648ffcbfa075229213deef7e87ab25f75b8a1a24f3' 
  AND token = 'tCYqCz0IP3qgq3uNyEl3sWu1W29KV3Jrtqfen6bWTaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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