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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '690675e52ee3f2a5e947472c7140f93711421f502156035b1f7df6336b5a9099' 
  AND token = 'mXa9wbFbECzuYT4aLSaQvbKwi2Dt/MBmsKoLX9iEXjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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