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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f33f94134dcc70b82fb967a780b3e9e148765115c1c5ee3a7ec0ba82b5cee0' 
  AND token = 'QiCzcsdrixcrz1G+BRYXuRzFBSSViYkezx0rxZeKX3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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