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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe7547394e1e5625f55593900079099d0ee06526bb59fb6049ea84c2bdd405ad' 
  AND token = '7SpQ54gs79j9E38uZtYgmR4meGgxKNjvzQ5OVMnNSzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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