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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3edb213787ad7ca1fcb912832ddeff5bee6f46096ea2a8842112066348283022' 
  AND token = 'xbypudN4Ld/pfESwlIy4MSynzhny0iFD3Kuz+cjpp/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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