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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6c6e6a3a2fe2e7c5bad6fe7ff18857c96246c3f57bb779e4dd6b9fb60c71837' 
  AND token = 'Ofy9hgs++DjeKL4M0pBm6K0IhYc7qV1cyeJYqYD20XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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