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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '872ac1438e807a4fdbc8c963ad1e7603f4ebd8adf98b2608db4c2257b3ebd72b' 
  AND token = 'NJGi4oBWzwVTWozoEkiW0LNtRAbQofkw+DiiJXhcM0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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