Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd43f26c939e2c862649acb07b4cf9d2317793f15e9d1af1540404a5db68b3c1' 
  AND token = 'LnQdih3cXpi0GbZUWOf+04h0FuUq3YFjIAFyQywnLMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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