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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82c99364ebf2f05879fd829557402fb8aa6568c0aabef5ced8d3993edacadf1c' 
  AND token = 'neEpLN46mT5L3QHMUqLgVs9XW/Mqaro3ckWJ/IQRwl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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