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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49baf69e355e3e547723878a4e95245c14c9fa4c3fdb7ea6e1704ac15f40a4c7' 
  AND token = 'fmypyIiOgtI+fTqNIflzLvgfnPyJqgdv2hn6DqqOW0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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