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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5038f43962e24f8c065aeee829b2110f1f869f189f56b71afc2f862b08d78d7c' 
  AND token = 'IxJJaYNORAXuGa3H45Xh24OGZtOpe4iQIFdaYqz/t9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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