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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '734c02fd461c072ee57bea64c48e1144869b1beac321662f74ce262c42befc02' 
  AND token = '9ixj/EHP/Hjgme2tXfKusgDO4L/5IdLiYiHR4ymX4NA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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