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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89dadfbfb8e3a9c702279765781b6e2da9fde6f691fefd3610b68e039e20d438' 
  AND token = 'RXZK6ZSVJVccIMBSbw0Rd6uI7rDNHT106fpq/aDXi7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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