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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '004fa78f540f0ca418297097507ad8cc39c8ddd4109ade0b73c1d8ea236b3d40' 
  AND token = 'WMUfEw6IrvjjZ9YmfvQb0Pk7xyFUn2OgGif7aPLnmIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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