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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c565857f215246cdc2eb30d68200d8e1ff9c8082447cc055727408f5338c512a' 
  AND token = 'L4NIFfPDigqPZ4fej5iNuwYMP2pwP/S+UkvdrqGql+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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