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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63fb9a0b149afd9fe8f243a1a9f5f96cc913e208548ffa5b7071013865d47c2b' 
  AND token = 'gAMP90EbLqzP7UxfavWXKoMUB/teSIiA0yzOyjS7pEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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