SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01edf26bb4e88826ef8f6f26d346041c334ef6f5850f3a87befbdbe1aa605cab' 
  AND token = 'UHaHahRk5oPY0TlC7YsjvGLQB/4vKnwPiknGq/KglvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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