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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '131b5d8f69fdfd2cd403cb0c1b696a6ae9b678529f4b61b022b0de77f438165d' 
  AND token = 'a//tEtgtmhi7CZ5B6PKRz2ZO3lcNYLONdCFqI45BnA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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