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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49d24b07ad4b8c15bb8772917e51eeeb6726846b52e835eadfa74aee639fc9d1' 
  AND token = 'IAFJOvyLySReMv294O7f6njOwLOM4d+8Nh1rsZjs6Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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