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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e91dad663cadd8f24e80e28018dbd5aee0f661b78e0cb678d522f48d8511f699' 
  AND token = 'A85TiRghJOIp6DiyLu8HefWuwg3EkrHRuGyupOcqg+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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