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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea0ee447b6e1ac5f36d80a7e44de08c20b9c6bf13275c7239150ff90e2e267cc' 
  AND token = 'ML0JoXXIk8z0gZ24hd/Hsl6U4y0Z4V2xFavJn3r/XXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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