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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '183f46b49ff32e989150c62ca1f58b7a3a4d35f3e33fb9545e0f91c9d592fcdf' 
  AND token = 'xB0ER53pSXEuecMw9F825G82V6KfhYMUJr4hkh0ZELg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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