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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '808e76df47384ec41d13cefd66b1ef29db43243d2af0825859f109280de4c19a' 
  AND token = 'OX6p4yetgGXLJ8QX9q6Q0XLyG+4ob4M90qd2/jj9UYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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