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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4c8a425f087c5c9ca5f7be109a945ba79abb789ef13d7bcd89ce3a068350495' 
  AND token = 'kDAaiWGF24f5lPI0j0jxL+o2+uOr+P2XfxMjFR/MLOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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