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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea711f8a8c72534d6a540fcc69d4327a8ad9a6dd272fbc43df1d6ceeca44bd24' 
  AND token = 'EkHwl3Z71wXPej7T4cyJzvS4l6Nro397mTUKJqqHM8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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