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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c26f5cbc201d64c85cce557abd6ce0c1a2d641eaf5a4e993041041d6ec5a7c1' 
  AND token = 'DUVnEiQcTxJi/bZiK2SsgeldTJLwob+oRGhGuLDTVGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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