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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a63a278dfbd6189b0f3d2fe85efa2ddb561751bf56f1050171ebefbe06d16d4' 
  AND token = 'Q9PCqKW/7uzBcumQTxJzl1RgnjXVHrcxsefeJxqrR/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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