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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a67779e69bf170960982da1e0cec18470944bb96ef5925537ca2aedc42cf85f' 
  AND token = 'L6Fd56wm1/C5rkWsZ6zuIDXVg9QY1Oqax8qXEn+JAbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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