SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74c4532fa5f98863972d22aca44b2c21b3bf6e9935fa9cfbed60735e43107eb0' 
  AND token = 'RKLZQqwTWekLO71wStjaCUXeSrKpjIhvBPZgTlz4LUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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