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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfb98b88e08ea09404cc9bb1f4a6c93d0405066d0cfdead8e3d6eb5c2b608c6c' 
  AND token = 'TFpJSmIJOyOfi0jwNNyKCiZ6RT+7jI0nOXzTH1p08dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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