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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3adf9973adb6937e5613406f230a07cb29567b5eed0444242dabea0abc198fcd' 
  AND token = '9WzyphB7bhCabN4YwaT6xqq3IJbj7E1ep+ilz6rFnWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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