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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17cfd8cbd26027c00a9fbb1ae2099c8a6a49e88a4d980cf8c6b086043f0b0427' 
  AND token = '1qBFCcwSsCEcU3LUJsincWpvYBAiCkjFTpv8pPKUePs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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