SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '949ef7bd0d3261c9e6a30c80f1c2a0b2648e35d5c19e3837ba8f28737a4e70d3' 
  AND token = 'V7BNh0AjOCsNqg/psBhsTPKc6s4SKZSKdbnpitgYJBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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