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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ce42bedff4d8c7ef0b39e0cff4cf6e167a0f69e0ce549adaaa5daf4155177f7' 
  AND token = '9DafN+8X8fXZt+1mw3UV9avks2ecdZawNmrx3SJoqYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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