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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c372df9e5280cd657dd0c845fbdcc7e585b7ea4d268b285649a8a8f8f8b5ffa' 
  AND token = 'mChpkxZYNfpfTofV8CEEtZlEla35Ueb6v8CowDzNYlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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