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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9728e75ab35173320ef2e66770d2a9282132c7514f01ec6898df346dd5ba9ef7' 
  AND token = 'sezEXDXAi8b0IpMgIKe+s//4V1TmcIeH98Bj9kKL4yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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