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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dc856e56a7bf025b3985a88a3f305a826a61d4e5ede282740cfa755fa1beb06' 
  AND token = 'tBRgu8S8FU5/c4cUp4e8Z5fCQbSXdqvFLDf+dZE+pDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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