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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b71e4158ae7765f03e3ac138b6970c35e11e86d465a1447d726e51363dc5b07' 
  AND token = 'wW8AqrpD0NXlYt6TtU5/wxUiZ+d9z3XrF90ZGj1RUMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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