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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92eb8c2af5b7fdf230be1147212a317f9b97f246c6cd76b447a7b1d94c681e6b' 
  AND token = 'o2DtqAOYqGARLmDxyeD1WIoaZ0wRx42VKaxvcJwsgQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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