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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c24c9bfc65edb987d2625705dbe4c5d7f8d8805c8ed790b203fd372c938d424' 
  AND token = 'QYsLwZXuuolyVzNIC02iokR0iXR+W6Y4EJD9IifuhWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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