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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95170e4f310ab8b719eb4a06ef13084fadb5897690c52dc07ab985836b4c59c2' 
  AND token = 'd8R6542rU/WtWWsVEBoFbadSFngYXVzlUzMUbg/RFZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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