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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '323413b907afc29d6251faa5e7b35139bb9e5c08486b4bf55214a60ee30b16a2' 
  AND token = 'uJ5wuQVxCkKu9+ADcp/JA/NnZ/5flf0FoykV1lEPdnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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