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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ee1f80646866125bec48d9e9724a8413a375061022b97acb731119ca1e076e9' 
  AND token = '0zqSl0saJ+SO98HnP1aCbX2YegNjPUMfbD/z23wRHFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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