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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19d45e2ba7b0cb0879d948960adb159ccc99c8bad8ef97bab0fcf963e66e778e' 
  AND token = 'NKWwU0zWG9o/YhP6tZ/Dj8OI8RnLYdkm+LOt0von570=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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