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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93896c30cbe650f3c8329564e8c8b80087c8e2b40cf595bacc2004df64100819' 
  AND token = 'piaP6kNDquuVyvxTrAC7d6fAj2y45YNXMvleI0NspNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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