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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecb1557c78ba23c0e88a6ff0ceb42b4eaedce9bea3ea50fb5f47831588ef3f83' 
  AND token = 'jzdiDJfjBJzA0jchoeMU0SYRzLZb7dWoLVix1SMYVVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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