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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e96523266a293c154da53c99839de2670c491f2ad8dc6e724b8b6616b4be1ccf' 
  AND token = 'UFwy+64MfpCQoG/NPNwJFxmD6WdDdcay3xqyamCv25M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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