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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fac4a8d152e81edd154bf0535e62ffe6be1f84acd6f6e7e3cbc0e7a8de6af072' 
  AND token = 'VE92VqPp/x9np89FS1pJjJrDcBFIUZGYph8EdJ/e6jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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