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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abdf9c1ffd12bec03b52c8dd5070a7f45b5b75b0492a478632a8671daae331bb' 
  AND token = 'knT46/KBf4qbr+k2A5fue4s5fYrlqA+dI0dskSseRyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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