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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dc8f20e4233f96a1cfc1b2eb559f43fea7219f3c090291415ecd2f6fbc3264c' 
  AND token = 'l3l6kzeN7Q3mZZcg7hMGjAUGCuyxRbY5Z6Lcck6J3/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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