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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3c60838ed81e00a946edb2c4e34884cbc52813483ee2fc40e0007584309857c' 
  AND token = '1QQHXsT5GeU7l5CgzinvTfb9fH62CVvWBYJDuN55hzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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