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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da0d3fce42b8178d7933f77b6cf4ff16e68e2d6971b8ed64474f2c0fbcedfe23' 
  AND token = 'bMkyOWlFIn9h8DWPftTiJy/VZy434px3VjP23Ej0gM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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