SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e602fd5b3e457516f9b9bdd2009ad03fc8c59d548c153fda58a63a1dcb9e84c' 
  AND token = 'n1g4GcdtViwJf/hQByjXFCuE6N12yLQlYunV9PMuByk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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