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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aee167b2d99f8019a14a02e66275dc9f5cee0cd03a7dcb58139a5b247caaec4c' 
  AND token = 'EgUpaFio+hNskF8GefvMW3UNhl7ty7TwCk9ETfDi/6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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