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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a18b83465f2e3bdb5581338c7e518ed23c55480e3748d165607503c8bd7b7527' 
  AND token = 'uX9kDDO68146+GmY63gaWEe1bUZTIWCyreA9F1HdCt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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